非旋波近似下Tavis-Cummings模型的定态能谱和纠缠演化  

Steady State Energy Spectrum and the Entanglement Evolution of Tavis-Cummings Model without Rotating Wave Approximation

作　　者：冯景佩 任学藻[1] 

机构地区：[1]西南科技大学理学院,四川绵阳621010

出　　处：《光子学报》2015年第8期148-153,共6页Acta Photonica Sinica

基　　金：四川省自然科学基金(No.13ZA0168)资助

摘　　要：利用相干态正交化展开法研究非旋波近似下Tavis-Cummings模型的定态能谱,以及模型中原子初态和耦合强度对系统纠缠度的影响.结果表明:系统的基态是非简并的,对应于两原子处于交换对称态.当两原子的初态处于交换反对称状态时,两原子间的纠缠能一直处于最大纠缠;在非旋波项的作用下,两原子初态处于非纠缠态时也能够产生周期性的纠缠.腔场与原子间的耦合强度对系统的演化有着重要作用.The steady state energy spectrum of Tavis-Cummings model without rotating wave approximation using displaced coherent state method was studied.And the influence of initial state and coupling strength to concurrence were numerically studied.Our result demonstrates that the ground state of the system is non-degenerate with an exchange-symmetry between two atoms.The entanglement between two atoms always keeps maximal when the initial state is set to anti-symmetric while the nonentangled initial state produce entanglement periodically due to the effect of non-rotating terms.The coupling strength between the cavity field and atoms play a critical role in the entanglement dynamics.

关 键 词：量子纠缠 非旋波近似 T-C模型 相干态正交化展开 耦合强度 

分 类 号：O431.2[机械工程—光学工程]